单选题 Whether you are an American citizen or a foreign national living in the United States, travel abroad requires preparation. Travel may be for the purpose of attending meetings or activities in other countries, visiting families or simply taking a vacation. This page is intended to provide guidance and useful resources.
What information do U.S. citizens need?
Depending upon the requirements of the country to be visited, citizens of the United States need to carry a passport that is valid for six months beyond the visit or documented evidence of their citizenship and identity (身份). In addition to a passport, some countries will require a visa. For more information, see Visa and Foreign Entry Requirements.
Current information on passports is available at the Department of State Passport Services and Information website. There is a new passport requirement for U.S. citizens traveling between the United States and the rest of the Western Hemisphere (半球). For details, see Western Hemisphere Travel Initiative.
When traveling to some specified countries, U.S. citizens may be subject to restrictions on publishing, the exchange of information, the sponsorship of conferences, etc.

单选题 What is the usual minimum limit to the validity of the passport held by an American citizen?

A、 There is no limit to the validity of the passport.
B、 The passport must be valid for half a year beyond the visit.
C、 The citizen can apply for a passport as long as six months.
D、 The minimum limit depends on the nature of the citizen"s visit.

单选题 American citizens can obtain the current information about passports from ______.

单选题 It can be inferred that there are restrictions on publishing when American citizens travel abroad because of ______.

【正确答案】 B

【答案解析】[解析] 推理判断题。由最后一段内容“When traveling to some specified countries, ...”中“一些特殊的国家”可以推出，可能这些国家与美国有利益上的冲突，才被称为“specified countries”，因此对图书出版的管制应是为了保护美国的安全。故选B。

单选题 This passage is mainly to remind American citizens of ______.

单选题 From the passage we can infer that ______.

A、 to get a visa is a new requirement for American citizens visiting other countries
B、 it"s easier for American citizens to get a visa from a foreign country than at home
C、 requirements for American citizens going abroad are not always fixed
D、 American citizens usually have difficulty getting a passport

【正确答案】 C

【答案解析】[解析] 推理判断题。由文中内容可知A、B两项错误，可首先排除；D项文中并未涉及，也可排除。由文章第四段第二句“There is a new passport...the Western Hemisphere.”(护照又有新要求)可以推出，要求不是一成不变的，故C项正确。